Constructors
ShmOpenFlagsshmReadWrite :: BoolIf true, open the shm object read-write rather than read-only.
shmCreate :: BoolIf true, create the shm object if it does not exist.
shmExclusive :: BoolIf true, throw an exception if the shm object already exists.
shmTrunc :: BoolIf true, wipe the contents of the shm object after opening it.